Signatures of Emerging Subsurface Structures in Acoustic Power Maps

Details Signatures of Emerging Subsurface Structures in Acoustic Power Maps Signatures of Emerging Subsurface Structures in Acoustic Power Maps

2010-03-22

arxiv.org/abs/1003.4305v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

7 pages, 5 figures, accepted for publication in Solar Physics on 21 March 2010

Scientific paper

We show that under certain conditions, subsurface structures in the solar interior can alter the average acoustic power observed at the photosphere above them. By using numerical simulations of wave propagation, we show that this effect is large enough for it to be potentially used for detecting emerging active regions before they appear on the surface. In our simulations, simplified subsurface structures are modeled as regions with enhanced or reduced acoustic wave speed. We investigate the dependence of the acoustic power above a subsurface region on the sign, depth, and strength of the wave speed perturbation. Observations from the Solar and Heliospheric Observatory/Michelson Doppler Imager (SOHO/MDI) prior and during the emergence of NOAA active region 10488 are used to test the use of acoustic power as a potential precursor of magnetic flux emergence.

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